213 lines
6.6 KiB
C
213 lines
6.6 KiB
C
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/* Copyright (C) 2000 MySQL AB
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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/* This file should be included when using nisam_funktions */
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/* Author: Michael Widenius */
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#ifndef _nisam_h
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#define _nisam_h
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifndef _my_base_h
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#include <my_base.h>
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#endif
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/* defines used by nisam-funktions */
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#define N_MAXKEY 16 /* Max allowed keys */
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#define N_MAXKEY_SEG 16 /* Max segments for key */
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#define N_MAX_KEY_LENGTH 256 /* May be increased up to 500 */
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#define N_MAX_KEY_BUFF (N_MAX_KEY_LENGTH+N_MAXKEY_SEG+sizeof(double)-1)
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#define N_MAX_POSSIBLE_KEY_BUFF 500+9
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#define N_NAME_IEXT ".ISM"
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#define N_NAME_DEXT ".ISD"
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#define NI_POS_ERROR (~ (ulong) 0)
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/* Param to/from nisam_info */
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typedef struct st_n_isaminfo /* Struct from h_info */
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{
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ulong records; /* Records in database */
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ulong deleted; /* Deleted records in database */
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ulong recpos; /* Pos for last used record */
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ulong newrecpos; /* Pos if we write new record */
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ulong dupp_key_pos; /* Position to record with dupp key */
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ulong data_file_length, /* Length of data file */
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max_data_file_length,
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index_file_length,
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max_index_file_length,
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delete_length;
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uint reclength; /* Recordlength */
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uint mean_reclength; /* Mean recordlength (if packed) */
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uint keys; /* How many keys used */
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uint options; /* HA_OPTION_... used */
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int errkey, /* With key was dupplicated on err */
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sortkey; /* clustered by this key */
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File filenr; /* (uniq) filenr for datafile */
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time_t create_time; /* When table was created */
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time_t isamchk_time;
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time_t update_time;
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ulong *rec_per_key; /* for sql optimizing */
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} N_ISAMINFO;
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/* Info saved on file for each info-part */
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#ifdef __WATCOMC__
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#pragma pack(2)
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#define uint uint16 /* Same format as in MSDOS */
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#endif
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#ifdef __ZTC__
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#pragma ZTC align 2
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#define uint uint16 /* Same format as in MSDOS */
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#endif
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typedef struct st_n_save_keyseg /* Key-portion */
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{
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uint8 type; /* Typ av nyckel (f|r sort) */
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uint8 flag; /* HA_DIFF_LENGTH */
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uint16 start; /* Start of key in record */
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uint16 length; /* Keylength */
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} N_SAVE_KEYSEG;
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typedef struct st_n_save_keydef /* Key definition with create & info */
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{
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uint8 flag; /* NOSAME, PACK_USED */
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uint8 keysegs; /* Number of key-segment */
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uint16 block_length; /* Length of keyblock (auto) */
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uint16 keylength; /* Tot length of keyparts (auto) */
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uint16 minlength; /* min length of (packed) key (auto) */
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uint16 maxlength; /* max length of (packed) key (auto) */
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} N_SAVE_KEYDEF;
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typedef struct st_n_save_recinfo /* Info of record */
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{
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int16 type; /* en_fieldtype */
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uint16 length; /* length of field */
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} N_SAVE_RECINFO;
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#ifdef __ZTC__
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#pragma ZTC align
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#undef uint
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#endif
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#ifdef __WATCOMC__
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#pragma pack()
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#undef uint
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#endif
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struct st_isam_info; /* For referense */
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#ifndef ISAM_LIBRARY
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typedef struct st_isam_info N_INFO;
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#endif
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typedef struct st_n_keyseg /* Key-portion */
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{
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N_SAVE_KEYSEG base;
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} N_KEYSEG;
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typedef struct st_n_keydef /* Key definition with open & info */
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{
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N_SAVE_KEYDEF base;
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N_KEYSEG seg[N_MAXKEY_SEG+1];
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int (*bin_search)(struct st_isam_info *info,struct st_n_keydef *keyinfo,
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uchar *page,uchar *key,
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uint key_len,uint comp_flag,uchar * *ret_pos,
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uchar *buff);
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uint (*get_key)(struct st_n_keydef *keyinfo,uint nod_flag,uchar * *page,
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uchar *key);
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} N_KEYDEF;
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typedef struct st_decode_tree /* Decode huff-table */
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{
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uint16 *table;
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uint quick_table_bits;
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byte *intervalls;
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} DECODE_TREE;
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struct st_bit_buff;
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typedef struct st_n_recinfo /* Info of record */
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{
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N_SAVE_RECINFO base;
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#ifndef NOT_PACKED_DATABASES
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void (*unpack)(struct st_n_recinfo *rec,struct st_bit_buff *buff,
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uchar *start,uchar *end);
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enum en_fieldtype base_type;
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uint space_length_bits,pack_type;
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DECODE_TREE *huff_tree;
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#endif
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} N_RECINFO;
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extern my_string nisam_log_filename; /* Name of logfile */
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extern uint nisam_block_size;
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extern my_bool nisam_flush;
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/* Prototypes for nisam-functions */
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extern int nisam_close(struct st_isam_info *file);
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extern int nisam_delete(struct st_isam_info *file,const byte *buff);
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extern struct st_isam_info *nisam_open(const char *name,int mode,
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uint wait_if_locked);
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extern int nisam_panic(enum ha_panic_function function);
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extern int nisam_rfirst(struct st_isam_info *file,byte *buf,int inx);
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extern int nisam_rkey(struct st_isam_info *file,byte *buf,int inx,
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const byte *key,
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uint key_len, enum ha_rkey_function search_flag);
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extern int nisam_rlast(struct st_isam_info *file,byte *buf,int inx);
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extern int nisam_rnext(struct st_isam_info *file,byte *buf,int inx);
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extern int nisam_rprev(struct st_isam_info *file,byte *buf,int inx);
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extern int nisam_rrnd(struct st_isam_info *file,byte *buf,ulong pos);
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extern int nisam_rsame(struct st_isam_info *file,byte *record,int inx);
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extern int nisam_rsame_with_pos(struct st_isam_info *file,byte *record,
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int inx,ulong pos);
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extern int nisam_update(struct st_isam_info *file,const byte *old,
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const byte *new_record);
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extern int nisam_write(struct st_isam_info *file,const byte *buff);
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extern int nisam_info(struct st_isam_info *file,N_ISAMINFO *x,int flag);
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extern ulong nisam_position(struct st_isam_info *info);
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extern int nisam_lock_database(struct st_isam_info *file,int lock_type);
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extern int nisam_create(const char *name,uint keys,N_KEYDEF *keyinfo,
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N_RECINFO *recinfo,ulong records,
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ulong reloc,uint flags,uint options,
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ulong data_file_length);
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extern int nisam_extra(struct st_isam_info *file,
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enum ha_extra_function function);
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extern ulong nisam_records_in_range(struct st_isam_info *info,int inx,
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const byte *start_key,uint start_key_len,
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enum ha_rkey_function start_search_flag,
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const byte *end_key,uint end_key_len,
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enum ha_rkey_function end_search_flag);
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extern int nisam_log(int activate_log);
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extern int nisam_is_changed(struct st_isam_info *info);
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extern uint _calc_blob_length(uint length , const byte *pos);
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#ifdef __cplusplus
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}
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#endif
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#endif
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